#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<math.h>
#include<string.h>
#include<time.h>
#include<stdlib.h>
#include<stdbool.h>
#include<assert.h>
#include<iostream>
class addsd {
public:
    addsd()
    {
        ret = ret + a;
        a++;
    }
    static int sum()
    {
        return ret;
    }
private:
    static int a;
    static int ret;
};
int addsd::a = 1;
int addsd::ret = 0;
class Solution {
public:
    int Sum_Solution(int n) {
        addsd arr[n];
        return addsd::sum();
    }
};
int main()
{
	return 0;
}